Eau Claire, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14.8 °C (high). Annual precipitation averages 1139.9 Millimeters. Eau Claire is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 0.7 °C | 83.57 mm |
| February | -7.5 °C | 2.3 °C | 64.77 mm |
| March | -3.7 °C | 7.4 °C | 85.34 mm |
| April | 2.4 °C | 15.1 °C | 99.57 mm |
| May | 8.6 °C | 20.9 °C | 97.79 mm |
| June | 13.2 °C | 25.2 °C | 127.76 mm |
| July | 15.3 °C | 27.3 °C | 119.63 mm |
| August | 14.4 °C | 26.7 °C | 100.33 mm |
| September | 10.7 °C | 23.1 °C | 104.9 mm |
| October | 4.8 °C | 16.2 °C | 85.34 mm |
| November | -0.2 °C | 9.2 °C | 85.09 mm |
| December | -4.7 °C | 3.2 °C | 85.85 mm |
| Annual | 3.8 °C | 14.8 °C | 1139.94 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |